Blue leveling dyestuffs of the anthraquinone series



United States Patent BLUE LEVELING DYESTUFFS or ANTHRAQUINONE SERIES Jacques Guenthard, Basel, and Richard Roth, Rheinfelden, Switzerland, assignors to Sandoz A. G., Basel, Switzerland, 21 Swiss firm No Drawing. Application February is, 1957 Serial N0. 641,812

Claims priority, application Switzerland March 29, 19 56 6 Claims. Cl. 260-372 In wool dyeing practice the dyestufis intended for application to woven fabrics are required to possess certain properties which provide for even distribution of dyestutf both on the individual fibers and over the entire area of the cloth. These properties include good solubility in water, a slow rate of dyeing in the region of acetic acid to sulfuric acid reaction, and the ability to migrate from the sites of heavy dyestulf concentration to more lightly dyed sites. These properties are especially demanded from those dyestuffs which as yellow, red and blue form the elements for combination dyeings in every gradation of shade. The three products forming such a set must be closely co-ordinated in their rates of dyeing and leveling properties if spotty dyeings are to be avoided. Furthermore their tastness prop'ertiesparticularly light fastness-must be of the same standard.

Fast, level dyeings can be obtained with the sulfuric acid dyeing dyestuffs. However, dyens are interested in finding dyestuffs which level well and at the same time give dyeings of better wet fastness than the commercially available brands. A precondition for improved fastness to wet agencies is higher 'aflinity for W001. 'Yet since the dyestufis which fulfill this requirement show poor leveldyeing properties they have to be applied from a Weakly acid medium.

The anthraquinone series contains blue dyestufis of this type which also find employment in combination with yellow and red dyestuffs possessing the same atfinity and fastness properties. However these dyestufis are not sufiiciently soluble and the available range lacks members yielding bright blue shades.

It has now been found that the blue leveling dyestufis of the :anthraquinone series which correspond to the gener-al formula SOaM demands mentioned in the foregoing. The lower members of this series in particular, namely those dyestnlfs in which m represents 2 or 3, have 'a solubility of at least 10 grams per liter in a 0.6% aqueous solution of sulfuric acid at 35-40 C. s i

The process for the production of the new leveling dyestuffs of the anthraquinone series admits ofcert-ain varia- 2,844,597 Patented July 22, 1958 SOaM wherein A and M possess the aforementioned meanings,

with 1 mol of a functional derivative of an a'lkoxy-fatty acid of the general formula m 2m+1 2) ,,COOH In wherein m and n have the aforenamed meanings.

An alternative procedure is to condense lmol of a salt of the 1amino-4-bromoanthraquinone-Z-sulfonic acid with ,1 mol of a 1-amino-4-acylaminobenzene of the general formula wherein A, m and n possess the above defined meanings. A third procedure is to react an anthraq-uinone derivative of the general formula 9 r acids and the amyloxy-, butoxy-, propoxyand ethoxyacetic'acids, or preferably the chlorides of these acids.

In the second operating procedure, condensation of the l amino-4 bromolanthraquinoneQ-sulfonic acid with the l-amino macylaminobenzene of Formula IV is effected advantageously in aqueous or aqueous-alcohol solution at 50100 C. in the presence of an acid-binding agent and a copper compound as catalyst. The l-amino-4- acylaminobenzenes employed in this instance are obtained by acylation of aniline or N-methylaniline with the chloride of an alkoxy-fatty acid of the general formula wherein m and n 'have the previously stated definitions, followed by nitration of the acylation product and reduction of the nitro group.

The third operating procedure of the process, the reaction of the anthraquinone derivative of Formula V with an alkali meta l sulfite, is conducted preferably in an aqueous organic medium within the temperature range to C. and under pressure. It is an advantage to use a mixture of -a phenol and a concentrated aqueous solutionof the appropriate alkali-metal sulfite as aqueous organic medium.

The anthraquinone derivatives of Formula V used as starting materials are obtained by condensing 1-amino- 2.4-dibromoanthraquinone with a 1-amino-4-acylaminobenzene of Formula IV at temperatures of 100-120 C. in presence of an acid-binding agent and a copper compound as catalyst.

The following examples illustrate the invention. All parts and percentages specified therein are by weight and the temperatures are in degrees centigrade.

EXAMPLE 1 8.5 parts of 1-amino-4-(4-methylamino)-phenylaminoanthraquinone-Z-sulfonic acid (obtainable e. g. by splitting the acetyl group from the 1-amino-4-(4'-N-acetyl-N- methylamino) phenylaminoanthraquinone 2 sulfonic acid) are suspended in 50 parts of pyridine. The well stirred suspension is given 6 parts of sodium bicarbonate and is then drop-fed at 20-25 in the course of 15 minutes with parts of 2-(isoamyloxy)-propionyl chloride. The mass is stirred until the starting substance is no longer indicated in a sample by chromatographic adsorption on a talc column.

The pyridine is eliminated with water-steam, and the dyestufi precipitated with salt, filtered olf and dried. Upon grinding it is obtained as a violet-blue powder which dissolves easily in water. It gives a reddish blue aqueoussolution which does not change color upon the addition of a little acid or caustic soda. With concentrated sulfuric acid, however, it forms a blue solution which turns green upon the addition of formaldehyde.

The new dyestuff dyes wool, silk and polyamide fibers from Weakly acid dyebaths in level, reddish shades which are very fast to light and washing.

A typical dyeing procedure is as follows: 10 parts of wool fabric are introduced into a dyebath at 30 composed of 1000 parts of water, 1 part of anhydrous sodium sulfate, 0.2 part of concentrated sulfuric acid and 0.1 part of dyestuff. The dyebath is heated to 100 in about 20 minutes and maintained at this temperature for 30 minutes, after which 2 parts of a 10% aqueous sulfuric acid solution are added. The evaporated water is replaced and dyeing brought to a close in 30 minutes with constant heating to keep the bath at 100. The wool, dyed to a reddish blue shade, is removed, rinsed with water and dried. Polyamide fibers are dyed in the same way, while for silk a dyeing temperature between 90 and 95 is chosen.

EXAMPLE 2 8.6 parts of sodium 1-amino-4-(4'-amino)-phenylaminoanthraquinone-2-sulfonate are dissolved in 400 parts of water at 60. The solution is cooled to 2025 and adjusted to pH 10.5-11 with sodium hydroxide solution. Then 6 parts of 2-(n-butoxy)-propionyl chloride are added in the course of 15 minutes, the pH value being kept betwen 10.5 and 11 by drop-feeding with sodium hydroxide solution. As soon as chromatography of a sample on a talc column no longer reveals the presence of the starting material, the dyestuff is precipitated from the solution with 40 parts of common salt, filtered off, washed with brine till the Wash-water reacts neutral, and dried. When ground the dyestuff is a blue powder readily soluble in water. It dissolves in water with a bright blue coloration which changes to greenish blue when a drop of sodium hydroxide solution is added. In concentrated sulfuric acid it gives a blue solution which turns green on the addition of formaldehyde.

The new dyestutf dyes wool, silk and polyamide fibers from Weakly acid dyebaths in level, bright blue shades of very good light and wash fastness.

EXAMPLE 3 26 parts of sodium 1-amino-4-(4'-amino)-phenylaminoanthraquinone-Z-sulfonate are dissolved in 800 parts of water at 70. The solution is cooled to about with 400 parts of ice, after which simultaneous dropwise addi- 4- tions of 15 parts of ethoxyacetyl chloride and 30 parts of sodium hydroxide solution 30% are made over a period of 30 minutes. The mass is stirred till the starting material is no longer indicated in a sample by chroma tography on a talc column.

The dyestutf is precipitated with 60 parts of common salt, filtered off and dried. When ground it is obtained as a violet-tinged blue powder, readily soluble in water and with a solubility of more than 10 grams per liter in a 0.6% aqueous solution of sulfuric acid at 35-40. lts blue solution in concentrated sulfuric acid changes to green upon the addition of formaldehyde.

The new dyestuif dyes wool, silk and polyamide fibers from weakly acid dyebaths in level, blue shades fast to light and Washing.

EXAMPLE 4 24 parts of 1-amino-4-(4'-methylamino)-phenylamino anthraquinone-Z-sulfonic acid are dissolved in 300 parts of water and 8 parts of sodium hydroxide solution 30%. After being thoroughly stirred the solution is drop-fed simultaneously at room temperature with 14 parts of sodium hydroxide solution 30% and 10 parts of 2- (ethoxy)-propionyl chloride. Following this, condensation is carried out in the manner described in Example 3.

The dyestutf obtained thus possesses similar properties to that of Example 3.

EXAMPLE 5 13 parts of 4-nitro-1-aminobenzene are suspended in 16 parts of pyridine. 16 parts of ethoxyacetyl chloride are slowly added dropwise to the suspension with stirring, during which time the temperature is raised to The resultant solution is maintained at this temperature for 1 hour; it is then run into 100 parts of water and the precipitated mass of the 4-nitro-l-ethoxyacetylaminobenzene filtered off. The filter cake is washed with water till it reacts neutral.

20.6 parts of native 4-nitro-l-ethoxyacetylaminobenzene are dissolved in 135 parts of methylalcohol, and 3 parts of alcohol-moistened Raney nickel are added to the solution. Hydrogen gas is introduced into the closed apparatus at room temperature with vigorous stirring by means of a vibrator mixer. On completion of the reaction (about 12 hours) 5 parts of filter earth and 5 parts of blood charcoal are added to the reduction solution, which is then heated to the boil over a period of 30 minutes and carefully filtered. When the alcohol has been evaporated the 4-amino-l-ethoxyacetylaminobenzene is left as a tough yellow oil which is further processed as such.

17 parts of sodium l-amino-4-bromoanthraquinone-2- sulfonate, 8.3 parts of sodium bicarbonate, 0.4 part of copper bronze and 0.2 part of cuprous chloride are suspended in 300 parts of water. To this is added a solution of 13 parts of 4-amino-l-ethoxyacetylaminobenzene in 25 parts of alcohol. The mixture is maintained at 65 for 8 hours with stirring. Upon cooling the reaction mass is given 3 parts of common salt and the crystalline dyestulf filtered olf. The filter cake is washed with a 3% common salt solution till the filtrate runs colorless. The dyestufi is dried at 100 and then ground. It is identical with the dysteufi of Example 3.

EXAMPLE 6 A mixture of 9.5 parts of 1amino-2.4-dibromoanthraquinone, 7 parts of 1-amino-4-ethoxyacetylaminobenzene, 5 parts of anhydrous potassium acetate, 0.1 part of copper bronze and 100 parts of n-butanol is maintained at a temperature of -1l7 for 12 hours. After this time the 1-amino-2.4-dibromanthraquinone in the reaction mass is no longer indicated. The mixture is allowed to cool, the precipitated dyestulf base suctioned off, washed with n-butanol, then with alcohol and finally with water, and then dried.

A mixture of 10 parts of this dyestuff base, 30 parts of phenol and 30 parts of a saturated potassium sulfite solutart-g;

tion is run into an autoclave. The autoclave is closed and immersed in an oil bath, which is then heated to 140 till all the components of the mixture have been rendered water-soluble, this taking about hours. When the reaction mixture has cooled it is taken out of the autoclave and treated with water-steam till the phenol has ben entirely eliminated. The dark blue solution is filtered free of minor impurities and the dyestuif precipitated from the filtrate by means of common salt. The'p'reiiipitate is suctioned off, washed with a 5% common salt solution and dried.

The resultant dyestuif is Example 3.

The following table contains further blue leveling dyestuffs of the anthraquinone series which have the general Formula I and are obtainable according to the particulars given in Examples 1 to 6. In the table they are characterized by the symbols A, m, n and M, and by th'e shade of their dyeings on wool.

identical with that of Table Example No. A m 'n M Shade of dyeing on wool 1 Na reddish-blue. 1 K Do. l 1 N11 Do. do. 1 Na blue.

3 (normal) 1 Na Do. (1 2 K Do.

2 Li reddish-blue. 2 Na Do. 2 Na blue. 2 Na Do. 1 ,Li 7 reddish-blue. 1 Na Do. 1 Na- 1 blue. 2 NH D0. 2 Na p 2 K reddish-blue.

2 Na Do. 2 Na Do. 1 Na Do. 1 K blue. 2 Na Do. 1 Na Do. 1 Na Do. 1 NH4 reddish-blue.

Example 1:

(I) N Ha sOaNa Ex sis is some Having *thus"dise1osa the"ihyexition what-is claimed is: 1. A blue leveling dyesfil'fibfth'e anthraquinonese'rie's which corresponds to the formula SOzM 2. The blue leveling dyestuif of the anthraquinone series which corresponds to the formula NHO-NH-O C-CHa-O-CHr-CHs Example 2:

(f NH:

Example 3:

SO Na NHONn-o c-e Hn-O-CHa-CHa 3. The blue leveling dyestufir' of the anthraquinone series which corresponds to the formula NHQi'I-Q C-CHz-CHr-O-CHr-CH;

2,844,597 1 4. The blue leveling dyestuff of the anthraquinone series which corresponds to the formula OINH:

O :Na

7 o NHONH QCCBr-GHr-OOHr-CH:-CHr-G J 5. The blue leveling dyestufi of the anthraquinone series which corresponds to the formula om v v cm o 'NH-OqlI- o c-om-cm-o-om-om-ofi I cm 6. The blue leveling dyestufi of the anthraquinone series which corresponds to the formula 1 References Cited in the file of this patent o UNITED STATES PATENTS 11,750,228 Kranzlein et a1 Mar. 11, 1930 

1. A BLUE LEVELING DYESTUFF OF THE ANTHRAQUINONE SERIES WHICH CORRESPONDS TO THE FORMULA 